Compound ball-mill.



R. BENE-IKE.

COMPOUND BALL MILL.'

,APPLICATION FILED SEPT. 17, 1909.

Patented Feb. 20, wi?.

l NN, u. WQ@ R Q Q THU ILVLFIL N a .Q Mb m V I n Il l @www R. BBNEKE.

GOMPOUND BALL MILL.

PPLIOATION FILED sum1?, 1909.

Peteneed Feb. 20, 1912.

2 SHEETS-SHEET 2.

L e e 45 ing a second modilication, in which the chan- UNITED STATES PATENT oEEIoE.

RICHARD BENEKE, o rBRoMsni-ts, GERMANY, Assicnonmorrnrrnp :confirm Hanni,

LHNEn'r, 'am:rmrefnsanrsoneEr, oF BROMBERG, GE,

To all'whqm it may'concem':

Be it knownthat I, RICHARD Bmrnnn," mercliant, a subjectof the King of Prussia, residing at No. 6 Mittelstrasse, Bromberg, German Empire, have invented new land use-- ful Improvements in Compound Ball-Mills,

of which the following isa speciication My invention relates to so-called compound balllmills, that is, ball grinding mills 10 whosedrumis divided by partitions A.intotwo or more'chambers in whichthe'material that is toberound is disintegrated in stages to different egrees' of neness, passing'auto-- matically from the chamber containing'large grinding balls into the succeed-ingchamber containing smaller balls. In" p'rior'mills of this class this continuous feed ofthe'lmaterial through the successive chambers has 1 been effected by means of so-called conveying-chambers, such as, for instance, are described inf VGerman Letters Patent No. 193,782. The defects ofsuch chambers, however, are that they occupy very considerablespace, the effectivel working-area of 4the grinding-drum being -diminished by this amount, and that the are relatively eXpensive to construct, so at the cost of the milla is considerable. i

According to myinvention, I dispense with conveying-chambers and. substitute therefor what I designate conducting- -hoods, whose outer surface is such that it can be utilized as grinding-surface. My invention is illustrated in the accom-.. panying drawing, in which:

Figure l-is a longitudinalsection of one form of construction of the newmill, the section being-taken on the line C-D of Fig. 2. Fig. 2 is a ragmental cross section on the line A -B ofFig. l. Fig. 3 is a lan of Fig..2.l Fig. 4 is a view similar to 4ig 1, showing a modification, in which a single annular hood is employed. Fig. 5 is a fragmental longitudinal sectional view illust-ratnels in the hoods are directed at right angles to the longitudinal axisf the drum. Fig. 6 .is across sectional, View of Fig. 5. Fig. 7 is a lan of Fig. 6'. Fig. 8 is `a view simllar to Fig. 1,-showing a thirdmodilication, in which the hoods are locatedin the'same plane as the exit-apertures in the drum-wall.

Referring more particularly to Figs. 1-3 the drum of the mill is divided by a parti- Specification of Letters'atent. p application n ied september' 17, 190e.` sqriarm. 51s,

aline-grinding chamberi `5, an imperforatershellflwhichamayebese 'cured to the drum 'inianytwellislmownman ner. The materialundertreatmentsiirrith z chamber 2 ypasses through vtheifapertiires-)"Gifje'o and falls upon the screen 4. The tailingstravel along the screen''toj the;endrithereoiVVA remote lfrom the apertures 6 andgfromithence' .-:s' back tothe ha'mberbfy means f'of the seoopsffr.- l1 Figi, while .the-liner material 'that passes c :65 through 'the-screen descends upon'gthe shell Ks in fred iintcf'alfconveyirfghamberza he conductors consistof plates or hoods 8, which lie direct againstthe` inner wall of Athe chamber 3, above the orifices 9 of the 75 latter. The plate 8 is angularly channeled on the underside at 10, so as to presenta' vertical passage above the orice 9 and .a

horizontal passage running parallel with the longitudinal axis of the drum and conducting into the chamber'3. p'

f The screened material from the shell 5 is conducted by the scoop 7 through the orifice 9 'into thwe channel 10 'of the hood 8 and thence into the chamber 3. The path of the 85 I material is' indicated inthe drawing' Aby the arrows a., and since the material enters the chamber in a direction parallel Vwith the longitudinal axis, choking of the channel 10 either by the material itself or by the grinding-balls' cannot occur.

It will be observed that the plates 8 in no Wise shorten the working-surface of the drum, since their outer face constitutes a grinding-surface. I prefer to form the to of the plate 8 with a longitudinally exten ing channel 8x as showni'n Fi 5, so that itwill act as a'shovel and 'continually throw olf sidewise the lballs and material falling upon it. rI his still further preventsv the v possibilityfof the channel 10 getting choked.

If desired, the channel -in the plate 8 might be so shaped that the surface which advances the material being ground constitutes a species of scoop, such as shown at 7, Figs.' 2 and 6, this surface, rising in. rearward direction, (if desired, .spiral'ly and thus preventing penetration of the bal s. into'v f the channel. Instead of. having a number olf-4 55 tion 1 into a coarse-grinding chamber 2 and detached plate/A8, a ring'might be employed, 110

i tinuous rinding surf a perforatedwall o' (F1g.`

as shwn in Fig. 4, which ring forms a' conace.

In mi s havin 8) through whi before reaching1 orifices 9 may e in the same apertures, and' thus without-t e drum 3 being shortened, for the essential feature of the invention being departed from. For the intermediate space which is formed is in no wise a conveyingehamber,in the f sense that the expression is employed in this speciication, but serves a totally dii'erent purose. A v

The horizontal portion-of the channel 10 in the plate 8, it is clear, need not necessarily run parallel with the longitudinal axis of the drum; it might for instance, run inclined .the material has 4to pass the outlet apertures- 6, the lane as these to such axls, or at right anglesto it, as

shown in Figs. 5, 6 and 7 Bymeans 'of this invention the cross section of the orifices throuh which the material enters the fine-grin ing'drum may be made. as large as desired, without there being any danger of the small grindingfballs of such chamber entering and choking such orifices. l

Havingv thus claim as new: A rotatable, drum having ing chambers, in lcombination with an imperfora-te -shell surrounding the adjacent ends of said chambers and secured to said described my invention, I

..drum,.'a screen between said drum and shell;

vanes in said shell at one end thereof, and longitudinall;r extendinhoods secured to said drum Within one o said chambers and separated from the peripheral Wall thereof,

-and covering openings therein; said chamtheir peripheral the spaces between the bers having orifices in walls; which, with hoods und the peripheral walls form passageways from vone chamber to the other.

In witness whereof I have hereunto signed lnyname this the presence of two subscribing Witnesses.

BICI-Hilti) BENEKE.

Witnesses HENRY Haaren, WOLDMAB HAUPT.

adjacent grind-v Qnd day of September 1909 in A 

